diff --git a/requirements.txt b/requirements.txt
index bb83ef94..e3c49fec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ pip==19.0.1
 wheel==0.32.3
 watchdog==0.9.0
 tox==3.7.0
-Sphinx==1.8.3
+Sphinx==4.1.1
 twine==1.12.1
 cryptography==2.5
 PyYAML==3.13